Double Naught Spy
Sus Venator
My initial reaction was "He shot at the suspect while the suspect was trying to leave? Seems risky." But as an LEO, I suppose he went into "apprehend or stop the threat" mode.
"Trying to leave" is an interesting thing, like the shooter at the Mosque in New Zealand was 'trying to leave' when he returned to his car the first time to get another gun and more ammo which he then took back to shoot more people or as he "tried to leave" and ran over a woman and shot at others ... on his way to another mosque where he shot more people.
It is hard, if not darned impossible, to determine the difference between "trying to leave" and things like "going to get more gear to kill more people" or "just going in a different direction to kill people" until after the fact.
I don't think the BP agent will have any problem in justification of his shooting as an attempt to preclude hard to others.